Five Cedrus deodara (Roxb.) G. Don. trees growing in Taipingmen Street, Nanjing City (yellow brown soil pH=6.68), were selected to determine the contents of 11 chemical elements (Li, Al, P, K, Mn, Co, Cu, Zn, Cd, Ba and Pb) both in the 1994’s growth rings, C(Z,t), and in the soils near the roots, C’(Z,t) of trees. The results showed that the relationship between C(Z,t) and C’(Z,t) followed the logarithmic linear correlation model, lgC’(Z,t)=a(Z)+b(Z)lgC(Z,t). Based on this model the chrono sequences of chemical element contents in the soils were reproduced from those in the tree rings; i.e., the dynamic variations in the chemical element contents of the soils at the sites were traced. The background values of chemical elements in the soil were calculated by taking the lowest values of the chrono sequences of the element contents in tree rings.